Combined reactions associated with L10 ordering
Combined reactions associated with L10 ordering
复制标题
与 L10 排序相关的组合反应
DOI：
10.1016/s0304-8853(03)00458-x
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发表时间：
2003
影响因子：
2.7
通讯作者：
W. Soffa
中科院分区：
文献类型：
--
作者：
T. Klemmer;Chao Liu;N. Shukla;Xiaowei Wu;D. Weller;M. Tanase;D. Laughlin;W. Soffa
最近，自组织磁性阵列 (SOMA) 由于具有实现大于 1Tbit/in2 的磁性数据存储密度的潜力而受到广泛关注。 SOMA 涉及合金纳米颗粒（例如 FePt）自组装阵列的化学制备，随后可以将其退火以形成 L10 高磁晶各向异性化学有序相。然而，在纳米颗粒的退火过程中，系统可以通过消除另一种固态反应（即烧结）带来的表面积来进一步降低其能量。因此，必须系统地理解有序化和烧结的组合反应。回顾了之前有关 L10 块状合金的工作，特别强调了有序和再结晶等组合反应的作用。描述了一种方法来帮助理解涉及有序和固态反应的组合反应，涉及消除晶体缺陷，如位错、晶界和外表面。作为第一次尝试，我们开发了这种基于本体固态反应的框架，并针对 SOMA 纳米粒子的情况进行了进一步讨论。
Recently, self-organized magnetic arrays (SOMAs) have received a great deal of attention because of the potential of achieving magnetic data storage densities greater than 1Tbit/in2. SOMA involves the chemical preparation of self-assembled arrays of alloyed nanoparticles (such as FePt), which can be subsequently annealed to form an L10high magnetocrystalline anisotropy chemically ordered phase. However, during the anneal of the nanoparticles the system can further lower its energy by the elimination of surface area which is brought about by another solid-state reaction which is sintering. Therefore, the combined reactions of ordering and sintering must be understood in a systematic way. Previous work on L10bulk alloys are reviewed with particular emphasis on the role of combined reactions such as ordering and recrystallization. A methodology is described to help in the understanding of combined reactions involving ordering and solid-state reactions concerning the elimination of crystalline defects such as dislocations, grain boundaries and external surfaces. As a first attempt, this framework based on bulk solid-state reactions is developed and further discussed for the case of SOMA nanoparticles.